| 摘要 |
PURPOSE: A flow channel control apparatus is provided to allow a driver to perform steering operation in a stable manner by controlling flow channel of hydraulic system in accordance with vehicle speed. CONSTITUTION: A flow channel control apparatus comprises a valve body(3) having a first communicating hole(3b) and a second communicating hole(3c) which are communicated from a bypass flow channel(20) of an oil pump(40) side to the bypass flow channel of an oil storage tank(10), a third communicating hole(3d) and a fourth communicating hole(3e) having diameters smaller than diameters of first and second communicating holes, and a chamber(3a) formed inside of the valve body for oil flow; a spool(1) incorporated into the valve body, and which has a first protruded end(1a) and a second protruded end(1b) formed at the outer periphery of the spool so as to open/close the second communicating hole and the third communicating hole, respectively; a spring(2) incorporated into the valve body, and which restores the spool to it's original position when the spool has moved; and a solenoid(4) inserted into the rear end of the valve body, and which allows the spool to move forward or backward.
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